Homework Answers
let X =X1+X2+X3+..........X11
where Xi are indicator variable whose value is 1 if floor visittd and 0 if not visisted
pi =P(ith floor visited) =1-P(none of 8 visted this) =1-(10/11)8
therefore E(X)= E(x1)+E(x2)+..........E(X11)
=11*(1-(10/11)8) =5.8684 floors
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